Pak Saiful owns a vegetable shop in the market. The vegetables he receives come from the central market. From that market, he takes from different suppliers. Below is the table of delivery schedules and the amounts delivered.
| Supplier | Schedule | Weight (kg) |
|---|---|---|
| A | Once every days | |
| B | Once every days | |
| C | Once every days |
On April , , Pak Saiful received vegetable shipments from all three suppliers simultaneously for the first time. The number of days where Pak Saiful does not receive any vegetable shipments at all from B and C during April is...